Produced between 1993 and 2011, Patek Philippe’s ref. 5016 was once the most complicated wristwatch ever crafted by the manufacturer. This remarkable timepiece combines three of the most challenging complications in watchmaking: a minute repeater, a perpetual calendar and a tourbillon, further enhanced by moon phases and a retrograde date. It wasn't until the launch of the Sky Moon Tourbillon, ref. 5002, in 2001 that Patek Philippe introduced a more complex piece.
Offered in all four precious metals, the platinum examples feature either silvered or black dials, each adorned with the movement number printed below the moon phase—a nod to the observatory chronometer pocket watches in the early 1900s. It is estimated that approximately 200 examples were produced before the model was discontinued in 2011.

The retrograde date is one of the hallmark complications in Patek Philippe's perpetual calendar wristwatches, captivating collectors with its flawless execution. The retrograde date hand has a flyback mechanism that gracefully resets to the first of the month after the 28th, 29th, 30th, or 31st, depending on the month and leap year cycle. This swift return is achieved through a spiral spring and an ingenious rebound limiter mechanism, both developed and perfected by Patek Philippe. The silvered dial features elegant Breguet numerals, presenting a tranquil aesthetic with a well-balanced layout for the perpetual calendar indications.

Housed in a relatively compact 37mm diameter case, the expansive layout and arched lugs provide significant presence on the wrist without appearing ostentatious. Through the sapphire case back, the wearer can admire the magnificent manual winding caliber RTO 27 PS QR. Each of the 506 components within this intricate masterpiece is hand-finished to perfection. In true Patek Philippe fashion, the tourbillon is discreetly positioned on the case back to minimize photo-degradation of the lubricant, thereby maintaining the tourbillon's accuracy, which harmonizes beautifully with the melodious chimes of the minute repeater.

To the best of our knowledge, less than 20 examples in this configuration have resurfaced in auctions. Fresh to the public market and beautifully preserved, this masterpiece comes with its original accessories, combining incredible charm and rarity—making it a potential crown jewel in any collection.